Function: Retrieves HTML for the Link URL buttons with the default link type as specified.

Function: Private preg_replace callback used in image_add_caption().

Function: Adds image HTML to editor.

Function: Saves a file submitted from a POST request and create an attachment post for it.

Function: Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload().

Function: Outputs the iframe to display the media upload page.

Function: Defines the default media upload tabs.

Function: Adds the gallery tab back to the tabs array if post has image attachments.

Function: Outputs the legacy media upload tabs UI.

Function: Retrieves the image HTML to send to the editor.